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If SpeedMasters react similar to Edelbrocks I'd say around 450 hp.

Trick Flows are off the shelf proven 500 hp plus heads with reasonable cam and cr, Edelbrocks can probably get there with enough cam but more than likely be under 500 hp unless ported, ported Aluminum speed masters are another option. Could get yours ported, 500 hp probably a stretch without a...

Didn't you know that's how all the kewl kids are do it :)

I notice that too, doesn't mean can't give some basic info on his question until/if he supply's more information. I've ask the OP to for further information too, doesn't seem to be coming so it's probably a best guess scenario.

OP asked about 360 heads, no one here is trying to force the dude to use them most said could work depending on goals. Your the one going around saying everyone is wrong without knowing the OP goals either, since he's interested in 360 heads my guess his goals is more than what 318 heads can...

Keep digging it's entertaining :)

That's a good one :thumbsup:

I wonder how he rationalizes your builds against his V/P index. Just maybe there's more than one to skin a cat :)

Agree 100%, all we can show the options and hopefully a realistic pros and cons of each and it is up to the OP to figure out for better or worse the best way to go, since everyone is different with their level of compromises. Eg. CR is (seem) everything to you, others can live with less and be...

:popcorn:

According to Darin Morgan about .200"+ valve to wall clearance the bore doesn't shroud flow, but doesn't mean there's not a net benefit to larger valves even if there's shrounding. 360 heads can fit on a 273 bore a 318 is .285" bigger so on the intake valve side of the bore you would have .143"...

How do you know there's gonna be loss of low end torque and or throttle response ? Beyond internet theory, dyno evidence even butt dyno evidence ? How do you know the J head velocities aren't enough for the OP engine ? Based on what ?

Now your going after a professional lol

You think rusty and other that taught you doesn't understand. Possibly? were not talking crazy big ports and super low velocities on a super small engine revving ridiculously low rpms. There's gonna be compromises, dudes building a low cr performance engine there compromise number 1, is the...

Your right he hasn't, most won't. You still can make hp with good heads and a mild ish cams look at factory LS and Gen 3 Hemi's. Ya like 5000-5500+ rpms on a 318. Yes probably from 3000 rpms and up maybe even lower. Possibly but to make 30-50 hp more is probably worth it even "IF" you give...

Is that the summary you got from 3+ years of asking others on this forum like Rusty how to build a mild 318 that someday you may own, now your telling him how to do it lol. :)

Too bad some people spending a lot of time and effort trying to convince people otherwise, even though you given a easily obtainable proven blueprint to follow.

Possibly if the OP doesn’t narrow down what he’s looking for. And even then there’s little agreement on the best course for doing a 318. Still waiting to here about V/P :)

Every time My uncle or cousin or me have swap a 340/360 top end on a low cr 318 has worked fine, my cousin had to run one in his late model stock car for a few weeks cause his 360 spun a bearing, he was down some power but still kept up with the leaders.

A 273 is 80% the size of a 340 if you look at the port cc and cfm there on par with there cid ratio with each other in other words a 273 head is about 80% the cfm and cc as a 340 X head. A 318 is 93% the size of a 340 but basically comes with 273 head a j head is more inline with what a...

Pretty good out of a warmed over 318, that pretty much anyone could copy.

Great work :) What was the before again ?

How do you figure ? Based on what ? Basically if the OP is fine making 200-300 hp then the stock heads are fine but if wants to make over 300 hp he needs to do something about the heads needs more air flow.

Rear gears and tire size to be used ? Also is it a 3.09 1st gear 4 speed ?

If it's apart can always take some off the deck also.

I sure someone could come up with one since it’s almost a certainty that someone is gonna say go with a 360 :)

Compression police are here now waiting for the displacement police :)

You can mill the 360 heads by like .030-.040" I forget exactly and keep at least stock cr.