[n20ta2]

I'm digging into my 69 YS block next week and I'm aiming for 550-600 n/a hp.. I would like to use edelbrock performer rpm round ports or KRE ported heads, solid roller cam, and compression around 10:1 or under. Is this attainable with stock stroke? I don't mind a radical street car so no concern there. A good cam head combo reccomendation would be great! I have not purchased headers yet so d ports or round ports are fine.

[tom s]

yes it can be done.With alu heads you can go 10.25 with pump gas.It will be one nasty street engine.Will needs lots of cam.Hope it is a stick shift car as if auto it will need a ton of converter and low gearing.Even if 455 600 needs a lot of cam to get there.Good luck with your project.Tom

[n20ta2]

Thats good to know! Its an auto, I'm guessing around 3800 stall will pick a converter once I have a cam picked out.

[Tom Vaught]

Butler has sold stock block 455 engine kits with cranks designed for BB Chevy rods for years that would make 600-650 horse and could easily be street driven.
A local guy here bought one of the engines. I have ridden in his 70 GTO several times.
Really nothing radical (little thump on the camshaft) and he drives it all over the city to car shows, etc. Very possible deal. They can sell you a crank/rod/piston deal and you have the machine work done elsewhere or you can get a pallitized engine with E-Heads delivered to your door.

Tom V.

ps My idea of streetable may not be the same as Tom S idea. LOL!

[tom s]

Tom,he is talking about 3 3/4 stroke!Tom

[n20ta2]

I thought about going with a stroker just not sure yet, by the time I install a new crank, forged rods and pistons I may be close to a stroker kit.

[68WarDog]

Although I have yet to make it to the chassis dyno, my goal was very similar to yours. As already suggested, you're going to need the right combination of parts to not only obtain the goal, but supporting parts to sustain it. Good luck with your project

[ta man]

Originally Posted by n20ta2

I thought about going with a stroker just not sure yet, by the time I install a new crank, forged rods and pistons I may be close to a stroker kit.

For a street car it would be more cost effective and tamer with more cubic inches.My new build will be over 600hp,close to 11 to 1 compression,pump gas,SD's OF 2.0 cam,SD's OF 2.0 head package.very street friendly.See my signature for old build with 10.2 to 1 compression,290cfm head flow and 236/245 dur cam with about .650 lift.Ran everywhere on 87 octane.

[Tom Vaught]

Originally Posted by tom s

Tom,he is talking about 3 3/4 stroke!Tom

Missed that Tom.

Not going to happen easily with a 3.75 stroke and be very fun to drive.

I did a 3.75 stroke 406 engine with good heads and a 600+ lift camshaft with a good intake
and it made about 545 hp at 6600 rpm. So to hit 600+ HP and be street-able would be
an excellent effort in my opinion. That little 545 hp engine would run 11.55 at 117 in a heavy car. Several here have been faster or maybe not with that size engine. I never read about that level of engine.

Tom V.

[n20ta2]

Ok, so I'm going to want a stroker combo then. Maybe a 462? Makes sense to me. Would stock port edelbrock rpm' s get me there?

[Tom Vaught]

462 would be a better choice IMO and there are some experts going fast with their cars.

This PY member for one: TA Man

http://forums.maxperformanceinc.com/...d.php?t=761935

When you are going as fast as he is going with a 3.08 gear you are really doing something.

Cliff Ruggles also has a basic effort race car (with a lot of tuning and effort on his part) and he easily runs faster than I every ran with the 3.75 stroke crank deal.

So there is a lot of knowledge out there on that deal. TA Man went from running 11.40s on page #1 of that thread to
a best et 10.9509 at 123.60mph on the latest pages of the thread (around page 35).

Tom V.

[jonmachota78]

If i can do it, it cant be that hard lol! Very streetable. Power brakes, idles 700rpm in gear.

[pastry_chef]

Sure, easy to make more power with more displacement.

If you want 600 HP with 3.75 stoke you will need to spin it up to build piston speed.
For such a combo I would not go lower than 10.5 compression, 11 would be better.
minimum 4.10 rear gear, 4500 plus stall.

Will run valve timing later today.

[GTOGEORGE]

Go on YouTube........KRE has plenty of dyne pulls of 600 HP aluminum headed pump gas engine combinations! Heck maybe Don (DCI) has a few RA5 pump gas engines also.


GTO George

[BADDTA]

Search: Dyno'd my sons 434

Brian

[RocktimusPryme]

I made 580 with a relatively tame roller cam. But as others have suggested. I have the stroke. I don't have anything particularly exotic so it's totally doable to push over 600

[n20ta2]

Thanks for all the replies! Excited to get this thing going! How is everyone feddling about the stock edelbrock round ports? Worth the money over a set of ported kaufmann d ports? They are around the same price and as I mentioned im starting from scratch so I have no headers yet. I would at least need new valvesprings to run a solid roller with the edelbrocks right?

[Scott Stoneburg]

I would go with the high ports, or edelbrock round ports with some port work. Using Wallace calculators my 474 is making about 580-600 with ported dports. A .600 lift roller, but 12 to 1 compression. With better head flow I don't see any issues making the power your looking for with 10.2-10.5 to 1.

[RocktimusPryme]

Originally Posted by n20ta2

Thanks for all the replies! Excited to get this thing going! How is everyone feddling about the stock edelbrock round ports? Worth the money over a set of ported kaufmann d ports? They are around the same price and as I mentioned im starting from scratch so I have no headers yet. I would at least need new valvesprings to run a solid roller with the edelbrocks right?

I have RP E heads, the earlier versions without the heart shaped chamber. They are worked some. Flowed 303 cfm at 28in. Made good power. From most of what I have read on here there isnt much a difference in power with D port vs Round port aftermarket heads. I asked the same question and got that answer. The big question you need to ask yourself before you pick D or Round is "what do you want to do for exhaust?" Then see if that option is available for your car, with that exhaust outlet.

Me personally if I had it to do over again, I would have gone D ports, because I was willing to sacrifice a few HP to use RARE long branch manifolds. Then found out they broke their mold for 67-69 F Body RP manifolds.......So I kinda got stuck using long tube headers. So figure out what direction you want to go and then make sure that avenue is actually available before you buy the heads.

RP exhaust is a little easier to install. More room around the bolts.

[Scott65]

If I were to buy my edelbrocks today, I'd buy them straight from SD Performance. I ended up sending them to him post original purchase...