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I think the last year for the 383/335 was 1970. By 1971 Chrysler dropped it to an advertised 8.7:1 comp ratio, and was rated at 300 gross/250 net horsepower. Makes sense that a heavier car, with less gear and just 5 extra horsepower is the slower of the two. Converter stall also plays a role...

If using a 904 is an option, in the mildly hopped up scenario I might say its a tie or down to personal preference. I'm not sure if the lighter transmission and reduction in drivetrain losses completely make up for 23 extra cubic inches, but the extra room in the engine compartment will sway...

1. 383. Might be a bit heavier, but keeping everyhting else equal it still has an advantage. "Bigger" heads, slightly bigger cam, more compression and 23 extra cubes. Might be held back by the smaller carburetor vs a T-quad on a 360 but not by much. For scenario 2, 3 and 4 I would still choose...

I noticed the thing with the exhaust ports too. A 5.3 head gets better flow with a smaller valve than a magnum head. Heck, the LS3 heads have tiny 1.59 exhaust valves that can flow in the 190's @ .500 with that port. Thats still a smaller valve than the Magnum.

I’ve had this thought for a while. I think it’s the ports. I bet if you analyzed one of those ports you’d find it has good speed and port energy. Plus the combustion chamber is 40 years advanced vs our old iron heads. And they respond to cam swaps well because the factory cams are tiny! On non...

Yes. I can get 93 octane on any gas station where I live. I'll have to be careful with the timing curve, but I think it's doable. I just wish all these old iron heads had a quench pad like the small block chebys, i'd push the compression up a hair.

Yep, it's a 108 lsa cam. Awesome! I don't want a rowdy idle with crappy vacuum on this engine. I still had some doubts about idle quality since I wasn't able to find a video on youtube of that cam idling. Everyone seems to go for the 270 Mega or bigger, and by that point idle quality is...

Awesome! The LSA was one of the major factors in choosing it. I rarely see people using short, narrow LSA cams and I wanted to give it a shot. Would you happen to remember how was the idle quality on that Pontiac 400? And at what RPM did the cam come alive?

Hi everyone. Anyone here ever run an Isky 264 in a 383 or a 400? I have one I’m planning to use on my 400 build. I’m shooting for 9.5:1 compression on this engine, I’ll use a 727 with the factory 10.75” converter, and the car will have 3.21 gears out back. I’m pretty confident this cam will fit...

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Looking to buy iron non roller adjustable rockers for a big block.

Understood. I actually did consider getting Mancini 2.08/1.74 valves but settled on replacement stuff since I’m not going crazy on my current build and want to keep budget creep in check.

So, if it were your build, you’d go for the Melling over the SBI valves?

Hello everyone. I have a Melling v0548 valve and an SBI 00548. I have noticed there are some differences between them. The SBI valve has a step on the underside of the valve head, and its finish is different than the Melling. (SBI on the left, Melling on the right in the first and second pics)...

Thinking about installing a hair bigger cam in that engine?

I never got to try the thick gasket. I switched the AVS2 out for an old school OEM AVS and the heat soak went away. I think it’s the bowl vent valve on the factory carb that makes a difference.

I was expecting both carbs to perform similarly. But I definitely didn’t expect the AVS2 getting the best MPH. And just about matching ET with the Brawler! Never thought they would be soooo close. And the AVS2 is 100cfm smaller. Wow! All edelbrock needs to do now is do something to address...

Thanks for the input guys. I won’t be using them. Regarding re surfacing older lifters…… the set I pulled from the 400 all looked good, didn’t look like they failed or anything. I can post pictures later. My question is, would those be a candidate for re-surfacing? Is there something else to...

Hello there everyone. These are a set of Hughes 5001 lifters. Bought them a little over a year ago. Was going over them and noticed one of them has some marks on its face (first photo) and another has a spec of rust on its face (second picture). All of them have some very light rust on the body...

I agree with the comments that the big block swap makes more sense in the context I would be using this car. Hard to argue against more low end torque on a milder build. If built with KB flat tops, I'd have a solid foundation of a short block. And if properly tuned, I expect the fuel economy...

Funny that you mention a 218 @ 0.050 cam for the 318, since the camshaft I'd use If I were to build the small block would be a comp cams 268H....... I actually started out by picking the 3.21 gears. My car has 26 inch tall tires. Cruise RPMS at 65mph calc out to 2700, and 2300 at 55mph. Going...

After going through all the comments, I’m starting to lean towards swapping in the 400. I kinda wanted the 318 build to make more sense since it would be logistically easier. But the more I think about it, the big block makes more sense in the context I would use my car. I will drive it a lot...

Hello everyone. I am in the middle of this dilemma right now and I wanted to hear your thoughts and ideas on it. I have a 75 Dart Sport with a 318 in it. My initial plan was just to rebuild it. But in January I acquired a 400/727 combo and now I’m kinda torn on what I should do. For the 318...

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Looking for an OE style coolant overflow tank for my '75 Dart Sport. Thanks!

Still have the 4638's left?

If you change your mind and are willing to ship, and if still available, I’m interested in a set of commando covers

I've been looking into the factory Chrysler cams. Specifically, at the Melling reproductions. The factory 318 is ground on a 109 degree LSA. I think the 360 2bbl cam is on 109.5 degrees. Here's the PDF I've been pulling the numbers from...

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