250 HP Slant Six - No Turbo

Actually a proper Text Book would be a combination of Articles and books reaching all the way back to 1960.. the first introduction of the slant six..

My first suggestion to you in addition to lots and lots of reading of this material is getting the best block you can find on the budget

I would suggest it be a Truck block... which is coupled to the type of trans you are chosing to use for a couple of reasons
Yup a BH block, has BH on the side of it...
#1) All Slant Six Connecting rods used in pickups, trucks and industrial engines by Dodge were shot peened from the factory.

#2) and early ones had a forged crank not cast crank

do you know about block numbering which will save you time in block selection of a good high horse output block?

if not you want to seek out one with preferabley a 2 or 3 on the side near the engine id info...

a block will never have a # lower than 2 because at foundry it started from 2 halves, when a bore area is changed in the 2 halve it adds 1 to the original starting number for each cylinder core changed in the mold process

so you are looking for a block with either nonereplaced or only one or two because this can affect the bore center, and water jacket position in the final cast iron block

Also of note is in the arly 60's there was a rare 251 cubic inch slant six made and it came in pickups and larger trucks as an optional engine...
I call bullsh*t on this...
Using the Mopar performance Engine manual as one of the references...

I suggest you use the Hyper pak Nascar set up which was Run by Lee Petty, Mavin Panch's Valiants in 1961 & 1962 only 3 races Mopar was so dominant in these that the plug was pulled on this 250 cu in and under race series Mopar got ists first sanctioning out for having too winning of a design..

They had a 244 degree duration cam the special Hyperpack manifold & Dual exhaust 4bbl carter AFB Carb..

The slant six head can be milled for compression up to around .090"

I removed .070 from the head on my 80 Chrysler Lebaron, it took my compression from 8.2 to about 9.5:1 I still ran pump gas no problem

eventually I plan to build a 302 Hp street legal car to drive and play with

it can be done by working smart and paying attention to every detail

don't forget to make a custom 2 piece timing cover with the cam movement limiter built into it like Lee Petty had done on his race car to prevent cam walk oil system failure which eliminated him from his first race in series...
Does not need to be two piece just weld in an adjuster end off the rocker arm, measured to hit the cam of course and bolt it on..
this is an absolute must for any serious slant six horsepower project
I agree!!
Walt


TF