we have a customer with a 62 mopar 6 cylinder hyperpack and torkflight he wants it installed in a early plymouth street rod I had one back in high school in a 62 Lancer (Dodge version of a Valiant,before Dart compact) with a 3 speed and a hurst synchro loc shifter it ran ok as I recall nothing spectacular but could run with 273 2v or 318 Poly 2V V-8's automatics and 283 2V glide full size cars all I really remember about it is that it liked ethyl gas felt like it gained 25 HP on Shell, Sinclair, or Clark 100 Ethyl gas anyone have much experience hopping one of these up? any input would be appriciated, thanks, we've done a 250 and 292 chebbie and even a 235 stovebolt, all the Ford OHV sixes, but no mopars.
Smokey Yunick said the slant six responded to a few simple hop up tricks more than any other engine he ever worked on. I believe he was talking about the Hyperpak which was developed for NASCAR's short lived compact racing series (short lived because Valiant beat the hell out of everybody). The 101HP 170cu in Valiant was rated at 148HP with the hyperpak kit installed. That was more than 50 years ago. Guys have done some great things hopping up the slant six. Advantages, it has a good 12 port head design and a tough bottom end. But limited in displacement and long stroke inhibits revs. In a light weight car it can perform pretty good. An early Valiant, Dart, Lancer or Barracuda for example. When putting it in an earlier Plymouth or Dodge, you have to watch out as it is a lot longer than the old flatheads and does not fit in easily.
Aren't you in the hospital still? You're supposed to be recovering, not working! Glad your are feeling better!
They kicked my onery ass out wednesday night thank God. now we're in michigan at the in-laws which is where we were going when I had my seizure Tuesday morning
slant six exhaust reminiscneces by Peter Hagenbuch. "You put one, two and three, and four, five and six together and you run ‘em down about 6 or 8 feet and bring them together in one tailpipe and you’ve added great huge gobs of output." Original is at Pete Hagenbuch - interview with a Chrysler engine development engineer (part 1) http://www.allpar.com/corporate/bios/hagenbuch-interview.html#ixzz2onv1cNxP Follow us: @allparcom on Twitter | allparcom on Facebook
The 170 has a very short stroke, not a long stroke. The 225 has a long stroke given that they achieved it by stroking a 170 by 1". The 170 makes less power than a 225 but somehow manages to be an even better engine than one of the best engines ever built, the 225.
The Jalopy Journal
