Search found 8 matches

by broflow
Thu Oct 04, 2018 1:17 pm
Forum: Propane Forum
Topic: 377 small block chevy, dual 425s, many issues?
Replies: 18
Views: 6503

Re: 377 small block chevy, dual 425s, many issues?

good info on the excess flow valve. I will open the valve slower from now on, that could be it? I haven't had time to find out yet.
by broflow
Thu Sep 27, 2018 5:25 pm
Forum: Propane Forum
Topic: 377 small block chevy, dual 425s, many issues?
Replies: 18
Views: 6503

Re: 377 small block chevy, dual 425s, many issues?

The tanks are mounted with brackets that orientate them with the top up. In looking at the cut-away picture I wonder if the bent pick-up tube has rotated or possibly come off? I assume I'll have to take the fill/outlet valve off the tank and that the pick up tube slides in under it? What I don't und...
by broflow
Mon Sep 24, 2018 9:06 am
Forum: Propane Forum
Topic: 377 small block chevy, dual 425s, many issues?
Replies: 18
Views: 6503

Re: 377 small block chevy, dual 425s, many issues?

So I'm still learning and working the bugs out on my rig. Life gets busy and it's been collecting dust in its corner of the shop but I'm back on it again. Anyways I have eliminated my blown head gasket and got a new distributor that is curved properly for the lpg. I've been able to drive it around a...
by broflow
Mon Aug 07, 2017 8:27 pm
Forum: Propane Forum
Topic: 377 small block chevy, dual 425s, many issues?
Replies: 18
Views: 6503

Re: 377 small block chevy, dual 425s, many issues?

As noted broflow, you may be pushing the line with 12:1 + compression. Your cam can tame it enough to get past the detonation range but it is close imo. I run a 377 at 12.5:1 compression lately. Iron heads. The cam specs are quite important, the lsa makes a big difference. You have only given durat...
by broflow
Thu Jul 27, 2017 5:06 pm
Forum: Propane Forum
Topic: 377 small block chevy, dual 425s, many issues?
Replies: 18
Views: 6503

Re: 377 small block chevy, dual 425s, many issues?

Heat riser ports are blocked off. and currently I do not have a hood on it so that should be helping to keep cooler air coming in. I could fabricate some sort of an air intake in the future. I'm a sheet metal worker by trade.
by broflow
Wed Jul 26, 2017 9:30 pm
Forum: Propane Forum
Topic: 377 small block chevy, dual 425s, many issues?
Replies: 18
Views: 6503

Re: 377 small block chevy, dual 425s, many issues?

Sounds like a nice engine package. The thing to remember is that the timing specs you will typically find on our site refer to factory produced engines. The SBC in the early 80's only had about 8.5:1 compression. The late 80's and 90's upped the number to a high of 9.5:1. These engines required a m...
by broflow
Tue Jul 25, 2017 7:10 am
Forum: Propane Forum
Topic: 377 small block chevy, dual 425s, many issues?
Replies: 18
Views: 6503

Re: 377 small block chevy, dual 425s, many issues?

I am located in the southern Wisconsin, U.S. I do not have a vacuum advance style distributor. Its mechanical advance only. I set the timing at 30* full advance at 2500-2600 rpm. That put my idle timing at 10* or so from what I remember. I don't have any audible detonation at Idle or when revving th...
by broflow
Tue Jul 25, 2017 12:14 am
Forum: Propane Forum
Topic: 377 small block chevy, dual 425s, many issues?
Replies: 18
Views: 6503

377 small block chevy, dual 425s, many issues?

So I am new to propane and new to this forum. Many other forums seem to lead to here and I've read many,many informative posts here and elsewhere. The more I read, the more I learn but the more confused I am on some aspects of propane. Anyways let me tell you what I have and what Im experiencing and...