Has anyone used an Offenhauser 5694 hi-rise dual quad intake on a 327, and a couple small 450cfm carburetors? A buddy and I are putting together a fresh small journal .040 over 327 with 461 double hump heads and a mild cam (.495" @ 218 intake and .502" @ 224 exhaust, 110 LSA). The engine is destined for a 67 Chevy pickup with a muncie 4 speed. We are considering using this intake, simply because we have it, but we're wondering how much low end torque we might be giving up, since it is one of Offenhauser's 360 degree jobs, which is basically a single plane open design with a plenum divider running front to back and small transfer port in the middle. If you have any experience with one of these intakes on a 327, I'd like to hear to your impressions. Or if you're 327 guy who knows what works and why, we'd be interested in your thoughts as well. Thanks. The intake in question:
I had a low rise version on a 327 ( 5253) and then on a .060" over high compression 307 . It ran just fine . I used two 2 inch spacers on it for a while and it did help the top in a bit As i recall it makes slightly less than others . The high rise version might do better . Its not going to beat a good modern single carb but it will sure look great and be close some 390 Holley carbs would do well . I ran them for while I may be using my low version on my 57 Vette with pair of 450 Holleys on a 383 in the future again . I had to turn them side ways to clear the distributor
I run the shorter version with carb spacers on a couple different mild performance 350's with 600 cfm Carter carbs. I think you'll be just fine running it.
I appreciate you sharing your experience, 1biggun. We'll probably give it a try....unless someone chimes in saying their friend's uncle's third cousin tried and it blew up and killed him.
Thanks for that comment swade41. Going to have to check that out. The hi-rise is taller. Crab style cap maybe?
That block of wood is what it took to clear, this is with 2 inch carb spacers and you can see the relation to distributor
I miss spoke and ran out to the shop and verified I was wrong . the carbs fit but the distributer wont. You need to turn the carbs side ways or a front distributer drive adapter ( That I have) or a crank trigger set up. I have consdiered the crank trigger set up as its going more modern set up and may have some msd type electronics . I don't know if the crab cap on a Mallory will work . I had BBC also intake and forgot what I had on what . I edited my post . the picture is just the carbs sitting on it I had Edelbrock 500's on the SBC last and it ran pretty damn good . Carters would run good also.
Chevy SB/BB V8 Low-Profile Pro Series Pro Billet Distributor with Crab Cap Red | eBay I wonder if this would fit ? not HAMB stuff but if it works ?
https://www.speedwaymotors.com/Chevy-V8-Mag-Look-Electronic-Distributors,1695.html Would one of these fit? They look skinnier. Gary
I realize that this is a necro-post but here's some info that may help. In 1967, I used a 5694 on an 12:1 motor (Jahns Cast Pop-ups) with 461 heads and an Isky Z50 cam & two 600 4160 Holleys, which I believe were 1-13s (precursor to the 1850). The motor was a small journal 327 and used the crank for our very first warrantied 350, which had spun mains. Back then, the GM warranty guys would allow purchase of warrantied materials that were "destroyed". I paid $45 for the short block. I think that the machine shop charged me about the same amount to cut the crank to fit the 327 case. To gain clearance, I used a '56 Corvette dual point distributor which had the cap mount surface cut down .080 and machined internally to allow fitting a cap from a late-30s-40s Olds/Pontiac straight-8. This also required the point cam to be shortened and re-slotted to accept the use of a rotor from the same vehicle. I measured the difference in height of the caps internally and the machining of the distributor housing to arrive at the amount to machine from the point cam (the amount escapes me as it's been a long time ago). I also had a homemade 5/8"(?) wood spacer under the rear carb. Furniture-grade plywood soaked in Thompson's. Despite being in need of re-jetting, this thing ran quite well and was later used for commuting (w/4.30 rear!!) to Ft. Gordon from eastern N.C.
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