4- barrel for a 306, check specs & comment

[Caprimaniac]

Ok, I see the difference there on the Cleveland heads, clearly.

Why do I come ine here now? Wanna get rid of frustration!
After spending hours looking at different cylinder heads, AFR closely, I just canno seem to find something that suits me well... The AFR's either come fully assmebled, with wrong valve springs, retainers, locks and rocker studs (but clearly a gud buy at 1800 with CNC machined ports, bowls & chamber) or bare unported and unfinnished... If they only had have been ready ported & with finished valve seats!

The "correct" out of the box part numbers are hard to come by, sometimes. A note on the 205 AFR's also say "will not accept rail rockers" while the Jesel part number KSS-516060 says it fits all AFR up the the 225 heads. (It might be the spring diameter that cause this?)

[blykins]

Which cam are you going to run? Roller or flat tappet? The heads are available with all sorts of valve spring combinations.

A rail rocker is considered a pedestal mount rocker arm, like the factory 5.0 engines had. The rocker arm is just bolted/torqued down to the head, without the use of a guideplate and rocker stud.

I just built a 347 a few months back with AFR 185cc heads and a very mild solid roller cam that made 490hp with an undersized carburetor. The AFR heads are very good heads. I hate to go over about 500hp without a lot of block prep (main girdle, studs, etc) because the biggest weakness here is the factory block.