Search found 738 matches

by storm
Thu Feb 25, 2021 8:28 am
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

When hunting for torque the only stock stroke small block better than a 383 is a 400, I really do like your choice. My old 1977 TA had a 2 core radiator when I bought it and from my research that was factory fit for a non-AC car. Due to extremely high heat potential in Australia and the fact I would...
by storm
Sun Feb 21, 2021 3:48 pm
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

Hi Marc Wisdom comes with age... Are you calling me old? :lol: Of course, it is nice to think of all the power of a large performer engine. Very true and when planned well the fuel consumption of a well developed, built, tuned, and driven engine can be quite good. When I owned my Trans Am (1977 Band...
by storm
Sat Feb 20, 2021 3:17 pm
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

Hi Marc Work out your budget and go from there, What can you realistically afford? Now ask yourself. Do you want a nice cruiser? Do you want a street racer? Do you want a race car? Each of these have a very different driving style. With regards to the idea of fitting an Impco 600 I'd be asking what ...
by storm
Fri Feb 19, 2021 9:42 pm
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

Blueprint have a pretty good reputation as far as I am aware.
by storm
Mon Feb 15, 2021 7:25 pm
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

Good to see you are moving along. Take plenty of photos and share your findings.
by storm
Thu Feb 11, 2021 5:12 am
Forum: Propane Forum
Topic: dedicated propane injection systems
Replies: 12
Views: 3571

Re: dedicated propane injection systems

Everytime I watch this I am amazed that the LPG vapour starts out at such a low ambient temp. Your anti-freeze is is not only being punished by the the weather but by the liquid LPG entering the regulator and leaving as a gas at a temp still lower than freezing as well. You're doing a good job my fr...
by storm
Thu Feb 11, 2021 5:06 am
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

Off the top of my head I do not know the relevant oem specifications but you measure the centreline of the cam tunnel to the centreline of the crank tunnel and that will give you the distance. You then compare that distance to the oem specification. It is a fairly precise measurement, which things l...
by storm
Thu Feb 11, 2021 1:03 am
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

I think to add stain steel turnips in the baffle. If this is steel wool then yes that is a good idea. Something that makes the oil vapour collect and turn back into liquid form is a good thing. As said I measured wear on timing chain, and from what I hear it is still some wear... what would you do ...
by storm
Tue Feb 09, 2021 1:35 pm
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

From your description of the vacuum readings I would say your compression rings are ok. Also if your car sits for so long you may actually find the residue you have seen is old petrol that has "gone off". It thickens, discolours, and looks like oil, I never let it sit in small engines (lawn mowers, ...
by storm
Mon Feb 08, 2021 7:14 pm
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

Timing chain wear is measured pin to pin over several pins, easy check is pick the chain up in the middle of the sprocket, a good chain won't lift far. You also have the opportunity to grab a multi keyed set to get whatever cam advance you chose. Timing chain wear can be measure on the engine exact...
by storm
Fri Feb 05, 2021 4:50 am
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

I have a bad PCV valve. I already noticed oil being sucked too much by this valves, and oil on the throttle blades when dismantling engine.... More likely you've got a pressurised crankcase from poor piston ring seal. Good thinking there @Tom68, I hadn't considered the short block not have been reb...
by storm
Thu Feb 04, 2021 1:55 pm
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

Marc wrote:
Thu Feb 04, 2021 7:07 am
or/and add an oil catch can on the hose return to the mixer.
This is a very good option combined with a working pcv.
by storm
Wed Feb 03, 2021 3:41 pm
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

Now I feel I may have done a mistake… Don't worry about it I asked because it always helps to keep the end goal in mind when we are doing modifications. Let's go through some theory. Petrol is a liquid fuel so a petrol carb will behave differently because we are always trying to keep the fuel in su...
by storm
Tue Feb 02, 2021 5:21 pm
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

What are you wanting to achieve by doing this?
Marc wrote:
Tue Feb 02, 2021 5:27 am
Work progress - center plate removed - does it look Ok? Not exactly similar from both sides…
Playing with the grinding tools, I scratched the gasket surface somehow : I 'd think maybe I need now to use some silicone when using the mixer gasket…

Marc
by storm
Sun Jan 31, 2021 11:35 pm
Forum: Propane Forum
Topic: More Air Flow for a Model 425 on a 327 SBC
Replies: 66
Views: 1062

Re: More Air Flow for a Model 425 on a 327 SBC

Hi Marc I honestly don't know about the valve inserts/seats. The size differences, as far as I am aware, between the 2 valve sizes is 0.01". As long as there is enough material to seat the valve and have a visible boundary between the closed valve and the combustion chamber then I, personally, would...