Without knowing compression thickness of head gasket ?41 mabe,tulip valves or flat,tapered top on pistpns or flat all the way to edge ,how thick are top ring lands,rod length,has block ben decked ,does it have 3.48 stroke or stroker notice bore .040 will raise slightly ,if all fairly close to standard approx 9.75
where did you get 1 7/8 headers? what kind of adapters are you using? I would use 1 3/4 headers for a hot truck engine. are the sportsman heads ported?
I bought the truck with them on there. They are suppose to be hooker super comp long tubes. I'm kinda looking around for some headers on the used market right now, that I want to paint black, so I'll keep in mind the 1 3/4 recommendation.
Also, I'm not sure on whether the heads are ported or not. I'm guessing the sportsman heads don't come from the factory ported, right?
The sportsman heads can be nicely ported. Local here used those heads for quite a few years before upgrading to vic jrs. The car (67 Camaro) dipped into the 10s a few years ago with a 355.He then build a replacement 383 with victor heads.
The sportmans when ported flowed 265 CFM.
The headers you have should have a 7 bolt flange if they are 1 7/8 tubes. Those are big tubes...If they are hooker headers,make sure you buy the hooker pattern for the inside gasket if you replace gaskets
Opinnions are like ? well everone has one ,Heres mine if i were going to do the majorty street driving ,I would used 1 5/8 for low & mediun rpm range 1000-5200 with a 355 leave big tube headers for high rpm and 406 -and 434 guys and light weight vehicles ,more tpurque where you will be operating, I run 1-3/4 on my big block 496 in picture above it is in a 1953 chevy p/u Very happy with results
I can see using 1 3/4 inch header primaries on a 396,sounds like a good choice.
small block headers I see 1 1/2 inch primaries as a good choice for near stock applications. good point above
its a 496 a 454 .030 over .250 over stroke i have 113 cc aluminum heads not in picture 9-5 compression acomp 288 cam roller rockers comp roller chain pushrods 100 longer and 3- 500 cfm holleys sanderson headers 400 turbo 331 gears ,just a good ole farm truck
Yeah, the headers were on the truck when I bought it, but If i ever change them out I'll keep these suggestions in mind. Do different tube diameters on long tube headers make big differences in the sound of the truck?
Do you guys think I would gain much on the street by going up to a 750 carb?
I've been thinking about getting a Holley 750 carb, does anyone know if that will bolt up to my Edelbrock performer rpm intake? Or would I have to run an adapter plate?
Maybe you guys can help me figure this out... It seems like my truck should have a bit more power when I just punch it to the floor from a dead stop. So, I was hoping maybe a little bigger carb would help that?
I was thinking maybe when I floor it and those rpms go up, it's just not getting enough gas.
Maybe you guys can help me figure this out... It seems like my truck should have a bit more power when I just punch it to the floor from a dead stop. So, I was hoping maybe a little bigger carb would help that? I was thinking maybe when I floor it and those rpms go up, it's just not getting enough gas.
Am I correct in assuming that the motor doesn't have enough poop to spool the converter up and get up on the cam? What does your ignition timing look like. How much initial at the crank? How much in the weights? What rpm at full advance?
Suggest 20 degrees advance at the crank, 16 in the weights, all in by 2800.
I tried to find something wrong with the SCR/cam/DCR, but everything looks good as far as matching up. I see 10.2:1 SCR, DCR should be right at 8.3:1 with the intake valve closing at 47 degrees ABDC @0.050" tappet lift.
less duration on the cam would help you have to have a tighter lobe seperation in order to make the most power and step up on the carb a little and for the cam i would run around a 274 duration for the build you have going and about a 2500 stall to get the truck going
if you have to much duration its not going to make it run any better unless the motor has been stroked if it has a stock stroke your going to be dumping to much fuel and air into the motor thus not going to run right remember you can easily over cam a motor
camaro 355 what does stroking an engine have to do with the cam duration? Your last 2 posts on this thread,I dont understand?
do you have any math to go with your statements?
Thought I would bump this thread up, it now has a Holley 750 double pumper on it, it's quicker for sure.
Also, made a video of the truck. (it hesitates to start for a second, because i had the choke in the wrong position)
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