One of my cranks was already.010 . The ground it to 3.975 I believe. That’s for 1.850 rod(1.976 big end rod) but the 2.008 I believe is the same crank pin. Honda journal is 1.888/1.889 . That uses the 2.015 big end rod. Derek says that’s not an issue with some rods to size down or up that little amount to go with different bearings as the rods we got first are 2.015 but crank is cut for smaller 1.850 crank. Nitrating crank will make crank more durable . As long as your oil changes are regular to keep contaminated down so they don’t imbed in bearing your ok as far as I know.
Thanks Sean. Food for thought. Tho I'm trying to build for the most cubes maybe the block can't handle it. Idk.
Ok guys I have 73 heads on the car now and 72 heads. Which would you use for the build? Are there any cc differences or port flow differences between the two?
No major difference between the 72 and 73 heads performance wise and same cc which is supposed to be around 58 cc... However if the engine was rebuilt then they could have been milled already... I emailed you too by the way not sure if your email is the same...
Yes heads are about the same. Do not let machine shop bake heads for cleaning. This can cause cracking , this is a comment directly from mike at TA performance.
Those are some sick build Sean. I gotta get the#s together and see where things go. I'm sure the 350 can handle some serious power when built properly.
The 373.5 CID I used as a reference earlier was considered to have a 3.99 stroke and 3.86 bore. You can go more modest (and safe) with a conservative offset crank grind, a .030 overbore, and still get decent gains from more displacement. I think your biggest gains will come from the air flow more than the few extra cubes you'll see from minor stroking and overbore, but it all adds up for sure. Spend most of your time and money on the heads, get a high lift/duration roller cam, single plane intake with a large carb and some 1 3/4" primary headers and you'll be making some pretty good power twisting it to 7,000 (even if all you did was bore it .030 over and left the crank alone for 355 CID). You may need custom headers though if you start flowing that much air (1 7/8" or more).
I don't see 450 hp as being a problem at all with the proper air flow (intake, carb, cam, heads, headers) no matter which bore/stroke you used. It would be easier to achieve with more cubes, for sure. The example I posted earlier made 53 more hp than your target goal at 6250 RPM with 373 cubes (and this was from a set of heads theoretically set at a 'modest' 260 CFM flow). It's not hard data, but it gives you a good general idea of what to expect.
It will also be much easier to obtain goals such as this (even with 355 CID) when TA releases their heads, particularly if they manage to get them to flow 280+ CFM out of the frickin box. lol Not to mention all the other features that will be improvements over the iron heads (closed chamber, for one).
Your money (dollar for dollar) would be best spent on getting a set of these heads for your goals. By the time you had someone port a set of irons that could even compare to them, you'd probably have at least the same money, if not more, invested into them vs just buying a fully assembled and ready to go set of aluminum heads from TA. Spend a few hundred extra to have someone do some extra work to them and get even more flow. Might see closer to 300 CFM, if the current data on them holds true. You could make 450 hp using the stock cam with that much air potential. lol
Here's something more relevant to your goals: Ran another simulation using stock stroke and .030 overbore (355 CID), same 260 CFM heads, single plane intake, a modest 750 CFM carb, 1 3/4" headers, pump gas friendly 10:1 static compression with the TA 290-94H cam straight up (77* IVC) for safe DCR on effective compression with VE on the heads and static comp/scavenging, all of this used as a reference point. Power showed 452 hp @6250 and 422 ft. lbs. @5000. Anything more you do (more bore/stroke, larger cam, better flowing heads, more compression, larger carb, etc.) would just add to this.
There is a sticky thread on here sbout the heads... In a nutshell they are ver very close to releasing them... Those of us who have deposits down should get them before winter is over... By spring they should be available for anyone to order i would think... My heads are going straight to a professional head porter before they go onto my engine for dyno testing. Keeping in mind the cost of a buick roller cam setup, roller rockers, and aftermarket heads would cost more than most LS builds it is something to consider...
For schiznitz n giggles, trying out a 'max effort' N/A Buick 350 in the dyno sim with ridiculously good flowing heads, huge roller cam (my custom specs), 1200 CFM induction, etc. etc. bored and stroked to 373 CID (3.99 stroke, 3.86 bore) and got these numbers: 721 hp @7500 and 536 ft. lbs. @6250. That's almost 2 hp per cube. I could tweak it for more, but you guys get the idea. lol
